【单选题】精馏操作中,饱和液体进料量F,精馏段上升蒸汽量V与提馏段上升蒸汽量Vˊ的关系为( )。
【单选题】1,3- 环己二烯和 1,4- 环己二烯中哪一个在 200nm 以上有紫外吸收?
【多选题】Mesopotamian culture were brought by________
【判断题】Mesopotamian culture was among the earliest civilizations. The wheel, units of weights and measures, and writing all originated in Mesopotamia.
【单选题】反映企业在某一特定日期财务状况的会计报表是( )。
【判断题】当植物细胞内的NADPH过多时,不会对戊糖磷酸途径起反馈抑制作用。
【单选题】利息备付率表示项目的利润偿付利息的保证倍数。对于正常运营的企业,利息备付率应大于( )。
【判断题】Mesopotamian culture was among the earliest civilizations. The wheel, units of weight and measures, and writing all originated in Mesopotamia.